Cable cap with power indicator

ABSTRACT

A cable cap for a heating cable, and a heating cable assembly including a heating cable and a cable cap, in which the cable cap includes a power indicator that illuminates when sufficient power is supplied to the distal end of the heating cable. The indicator gives an installer or a user an indication that the heating cable is functioning properly the entire length of the heating cable. The cable cap may further include a connection feature, such as an aperture, that provides a connection point for a cable pulling device such as a fish tape.

RELATED APPLICATIONS

This application claims priority to U.S. Provisional Application Ser.No. 63/173,210 filed Apr. 9, 2021, entitled Cable Cap with PowerIndicator, hereby incorporated by reference in its entirety.

BACKGROUND OF THE INVENTION

The embodiments of the invention described herein are directed toimproved heating cables for applications such as the prevention of icedams on roofs and the prevention of pipe damage due to freezing. Icedams occur in colder climates that are subjected to snowfall. Someroofs, especially those found on older homes, have uneven heat lossprofiles. Heat from the interior of the home rises to the attic andescapes through the roof. Because heat rises, less heat escapes from thelower portions of the roof and especially over the overhanging eavesfound on most homes.

If there has been significant snow accumulation on a roof, heat escapingthrough the roof melts the snow, causing the meltwater to run down theroof until it hits an area of the roof that has a lower temperature. Ifthis area is cold enough, the water refreezes and accumulates as an icedam.

Ice dams are problematic as they can cause water to pool behind the dam.The pooled water is often forced up under the shingles and into thestructure below causing damage to a variety of materials includinginsulation, drywall, paint, flooring, windows, doors, cabinetry andmore.

Heating cables are sometimes used to address chronic ice dam problems. Aheating cable is arranged, usually in a serpentine pattern, near thelower edge of the roof, to create melted pathways through accumulatedsnow and ice for water to drain. These heating cables have a powerconnection end and a terminal end. During installation and use, it isdifficult to determine whether the power is being delivered to theterminal end. One method used to verify proper cable operation is tosupply power to the cable and feel if it is warm along its entirelength. This method, however, is impractical or impossible in mostapplications because the cable may be high on a roof, hidden within apipe, or otherwise inaccessible. As the cables are often more than 100feet long, it is not uncommon that sufficient heating power is notdelivered to the entire length of the cable due to line losses or damageto the cable along its path, etc. Regardless of cable length, if a cablebecomes damaged during or after installation, a proximal portion of thecable may provide adequate heat but a remaining portion distal of thedamaged may not receive sufficient power to provide adequate heating, ifpower is received at all. Moreover, damage to the jacketing on the cablecan allow water ingress, rendering some or all of the heating cableuseless. It would be desirable to provide a visual indication that poweris reaching the distal end of the cable to verify the cable is operatingcorrectly without adding unnecessary burdens or hazards to the propertyowner or installer.

Installing heating cable often involves pulling cable through tightspaces such as gutter downspouts and inside drainpipes. Installers uselong, coiled metal devices called fish tape to pull electrical wiringsuch as heat cable through inaccessible areas including pipes andgutters. However, given the featureless terminal ends of most existingcables, it can be difficult to effectively connect the fish tape to thecable. Given the stiffness of the cables, significant force is sometimesrequired to pull the cable through a desired route. It would beadvantageous to provide a cable having a terminal end with a featurethat can be used to make a connection to a fish tape or similar devicethat can withstand significant pulling force.

Some attempts have been made to address the problems of providing anindicator of sufficient power to the end of a cable. One example is theRayClic-LE Lighted End Seal Kit for use with some cables produced bynVent Raychem. This solution provides a light attachable to the end of acable but the design is bulky and thus can only be attached after thecable is installed. If damage occurs while the cable is being run, thedamage is not discovered until after the cable routing is complete andthe indicator is installed. This indicator also does not address theproblem of connecting the heating cable to a fish tape.

SUMMARY OF THE INVENTION

The present invention is directed toward a heating cable with an end capthat includes a power indicator and a connection feature usable toprovide a strong connection to a cable pulling mechanism such as a fishtape.

One aspect of the invention provides a cable with a terminal end havinga power indicator in the form of an LED that illuminates when anacceptable level of power is sensed. The LED may be housed in aweatherproof enclosure within the cable and having translucent or clearcovers on one or both sides such that light from the LED may be visible.

Another aspect of the invention is a cable with an aperture at itsterminal end that passes through the cable and can be used to connectthe cable to a cable pulling device such as a fish tape.

Still another aspect of the invention is a cable with both a powerindicator in the form of an LED that illuminates when an acceptablelevel of power is sensed, and an aperture at its terminal end thatpasses through the cable and can be used to connect the cable to a cablepulling device such as a fish tape. The LED may be housed in aweatherproof/waterproof enclosure within the cable and having windows onone or both sides such that light from the LED may be visible.

Yet another aspect of the invention is an end cap that is attachable tothe end of a cable and includes a power indicator that is activated byelectricity being carried by the cable.

Still another aspect of the invention is an end cap that is permanentlymolded to the end of a cable and defines an aperture that passes throughthe cap and can be used to connect the cable to a cable pulling devicesuch as a fish tape.

Another aspect of the invention is an end cap for a cable with both apower indicator in the form of an LED that illuminates when anacceptable level of power is sensed, and an aperture at its terminal endthat passes through the end cap and can be used to connect the cable toa cable pulling device such as a fish tape. The LED may be housed in aweatherproof/waterproof enclosure within the end cap and having windowsor translucent covers on one or both sides such that light from the LEDmay be visible.

In one or more embodiments, the end caps described herein are molded tothe end of a cable during production, resulting in the end cap becomingwaterproof and permanently attached to the heating cable.

Yet another aspect of the device is that it is low-profile and closelymatches the cross-sectional profile of the heating cable. This isdesirable to allow running the cable through tight spaces as well as foraesthetics.

Still another aspect of the invention is a method of installing heatingcable comprising extending a fish tape through a space through which theheating cable is to be routed; attaching the fish tape to a connectionfeature of an end cap molded to an end of the heating cable; pulling theheating cable through the space using the fish tape; providing power tothe heating cable, thereby activating a power indicator of the end capthat signals electrical continuity is present across an entire length ofthe heating cable; and verifying proper operation of the heating cableby checking the indicator.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a perspective view of an embodiment of the present inventioninstalled on a rooftop;

FIG. 2 is a perspective view of an embodiment of a cable cap of thepresent invention;

FIG. 3 is a perspective cutaway view showing the internal components ofthe device of FIG. 2;

FIG. 4 is a perspective view of an embodiment of a cable cap of thepresent invention;

FIG. 5. is a perspective cutaway view showing the internal components ofthe device of FIG. 4;

FIG. 6 is a section view taken along section lines 6-6 of FIG. 4;

FIG. 7 is a side cutaway view of an embodiment of the cable cap of thepresent invention; and,

FIG. 8 is a perspective view of an embodiment of a cable of theinvention being pulled through a pipe.

DETAILED DESCRIPTION

Specific embodiments of the invention will now be described withreference to the accompanying drawings. This invention may, however, beembodied in many different forms and should not be construed as limitedto the embodiments set forth herein; rather, these embodiments areprovided so that this disclosure will be thorough and complete, and willfully convey the scope of the invention to those skilled in the art. Theterminology used in the detailed description of the embodimentsillustrated in the accompanying drawings is not intended to be limitingof the invention. In the drawings, like numbers refer to like elements.

Referring now to the Figures and first to FIG. 1, there is shown anembodiment 10 of a cable of the invention. The cable 10 has an elongatebody 12 of selectable length that has a proximal end 14 including apower connection 16, either in the form of a plug, wire ends or otherknown power connections for connecting the cable 10 to a power supplysuch as an outlet, a breaker box, or the like. At a distal end 18,opposite the proximal end 14, there is an embodiment of a cable cap 20of the invention. The features of the various embodiments of the cablecap 20 are shown in FIGS. 2-7.

FIGS. 2 and 3 show a first embodiment 22 of the cable cap 20 of theinvention. The first embodiment 22 generally includes a power indicator30, a connection feature 50, or both. The cable cap embodiment 22 has across-section that is shaped and sized to be flush, or only slightlylarger than, a cross-section of the cable to which it is attached. FIG.2 shows the cable cap embodiment 22 connected to a cable body 12 and thedifference in dimensions are visible at the point 24 where the cablebody 12 enters the cable cap embodiment 22. The cable cap embodiment 22envelopes the cable body 12 and may have a relatively uniform thickness.

The power indicator 30 may be embodied as a small light source such as abulb or a light emitting diode (LED). As is known in the art, a resistor32 of appropriate size may be used, if necessary, between the powersupply to the heating cable and the LED to reduce the voltage to adesired level. The resistor may alternatively be a component of the LEDor bulb itself, or be omitted altogether depending on thecharacteristics of the other components in the circuit, withoutdeparting from the spirit of the invention.

The power indicator 30 of FIGS. 2 and 3 extends longitudinally into anaperture 52 that forms the connection feature 50. The power indicator 30is an LED shrouded in a protective cap 34 that prevents damage to theLED from weather or during the use of the connection feature 50. The LEDis preferably thinner than the thickness of the cable cap such that noportion of the LED extends perpendicularly further than an outsidesurface of the cable cap and is thus protected. FIG. 3 is a cutaway viewthat shows the resistor 32 and two wires 40 and 42 of the cable body 12that supply power to the resistor 32. Also shown are two leads 46 and 48that connect the resistor to the LED 30.

FIGS. 4-6 show a second embodiment 122 of the cable cap 20 of theinvention. The second embodiment 122 generally includes a powerindicator 130, a connection feature 150, or both. The cable capembodiment 122 has a cross-section that is preferably shaped and sizedto be flush, or only slightly larger than, a cross-section of the cableto which it is attached. FIG. 4 shows the cable cap embodiment 122connected to a cable body 12 and the difference in dimensions arevisible at the point 124 where the cable body 12 enters the cable capembodiment 122. The cable cap embodiment 122 envelopes the cable body 12and may have a relatively uniform thickness.

The power indicator 130 may be embodied as a small light source such asa bulb or a light emitting diode (LED). As is known in the art, aresistor 132 of appropriate size may be used, if necessary, between thepower supply to the heating cable and the LED to reduce the voltage to adesired level. The resistor may alternatively be a component of the LEDor bulb itself without departing from the spirit of the invention.

The power indicator 130 of FIGS. 4-6 extends into a space 136 thatextends part way through the cable cap embodiment 122. The space 136 iscovered on one side by a clear, translucent or semitransparent cover 138that allows light from the LED to be seen. Alternatively, the space 136may be completely filled by a clear, semitransparent or translucentmaterial, such as during the molding process.

FIG. 5 is a cutaway view that shows the resistor 132 and two wires 140and 142 of the cable body 12 that supply power to the resistor 32. Alsoshown are two leads 146 and 148 that connect the resistor to the LED130.

In at least one embodiment, the heating cable 12 is self-regulatingcable that increases or decreases the amount of power being drawn fromthe power source to meet the demands of the weather conditions and thevarying temperatures across the heating cable. This is accomplishedusing a conductive core that houses the two wire conductors 40 and 42 or140 and 142. Unlike most circuits, where a hot and a neutral wire areconnected across one or more loads, either in series or in parallel, theconductors are not insulated and the material separating the conductorsbecomes the load. As the outside temperature decreases, the materialshrinks and the resistance across the conductors is reduced, allowingmore current to flow through the material. As the material heats up dueto the increased current, the material expands again, increasing theresistance and regulating the amount of heat given off by the heatingcable. As the ability of the material to expand and shrink is limitedand known, LEDs can be selected that operate in the correspondingcurrent parameters, thus obviating the need for more complex circuitry.The LEDs may further be selected to require a minimum amount of currentpower available at the end of the cable, indicative of proper operationof the heating cable, regardless of the temperature outside.

The connection feature 150 of cable cap embodiment 122 is an aperturethat passes through the cable cap 122. The connection feature is spaceddistally from the power indicator 130 to ensure that pulling forces donot damage the power indicator 130.

FIG. 6 is a section view taken along section lines 6-6 of FIG. 4. FIG. 6illustrates the depth of the space 136 and the aperture that forms theconnection feature 150. Though not shown, the aperture 150 may bereinforced, such as by lining the aperture with a steel rim or embeddinga steel rim in the molded body of the cable cap 122.

FIG. 7 is an embodiment 222 of a cable cap that is identical toembodiment 122 except that the space 236 that houses the power indicator230 extends all the way through the cable cap and has windows 238 and239 on either side of the power indicator 230 such that light emittedfrom the power indicator 230 can be seen from either side of the cablecap 222. As an alternative to windows, the space 236 may be filled witha semitransparent, translucent or clear material, such as during themolding process, in order to further protect the bulb 230 and strengthenthe device 222.

FIG. 8 shows an embodiment of a cable 12 with an end cap 122 beingpulled through a pipe using a fish tape. This is provided to show justone non-limiting example of the use of the connection feature 150. Thisexample usage applies to all embodiments of the device described herein.

Although the invention has been described in terms of particularembodiments and applications, one of ordinary skill in the art, in lightof this teaching, can generate additional embodiments and modificationswithout departing from the spirit of or exceeding the scope of theclaimed invention. Accordingly, it is to be understood that the drawingsand descriptions herein are proffered by way of example to facilitatecomprehension of the invention and should not be construed to limit thescope thereof.

What is claimed is:
 1. A power indicator cap for a heating cablecomprising: a power indicator that illuminates when connected to adistal end of a heating cable that has been connected to a power sourceat a proximal end of the heating cable; and, a connection featureconfigured to interact with a corresponding connection feature of acable pulling device.
 2. The power indicator cap of claim 1 wherein thepower indicator comprises a light emitting diode.
 3. The power indicatorcap of claim 1 wherein the power indicator extends longitudinally intoan aperture formed in the power indicator cap.
 4. The power indicatorcap of claim 3 wherein the aperture comprises the connection feature. 5.The power indicator cap of claim 3 wherein the aperture extends partwaythrough the power indicator cap.
 6. The power indicator cap of claim 3wherein the aperture extends through the power indicator cap.
 7. Thepower indicator cap of claim 5 wherein the aperture is covered by awindow.
 8. The power indicator cap of claim 6 wherein the aperture iscovered by two windows on opposite sides of the power indicator cap. 9.A heating cable assembly comprising: a length of heating cable between aproximal end and a distal end, the proximal end being connectable to apower source; a power indicator cap covering the distal end andincluding: a power indicator that illuminates when the proximal end ofthe heating cable is connected to a power source; and, a connectionfeature configured to interact with a corresponding connection featureof a cable pulling device.
 10. The heating cable assembly of claim 9wherein the power indicator comprises a light emitting diode.
 11. Theheating cable assembly of claim 9 wherein the power indicator extendslongitudinally into an aperture formed in the power indicator cap. 12.The heating cable assembly of claim 11 wherein the aperture comprisesthe connection feature.
 13. The heating cable assembly of claim 11wherein the aperture extends partway through the power indicator cap.14. The heating cable assembly of claim 11 wherein the aperture extendsthrough the power indicator cap.
 15. The heating cable assembly of claim13 wherein the aperture is covered by a window.
 16. The heating cableassembly of claim 14 wherein the aperture is covered by two windows onopposite sides of the power indicator cap.
 17. The heating cableassembly of claim 9 wherein the power indicator cap is molded to thedistal end of the heating cable.
 18. A method of installing heatingcable comprising: extending a fish tape through a space through whichthe heating cable is to be routed; attaching the fish tape to aconnection feature of an end cap molded to an end of the heating cable;pulling the heating cable through the space using the fish tape;providing power to the heating cable, thereby activating a powerindicator of the end cap if an entire length of the heating cable isoperating properly; and, verifying whether the heating cable is fullyoperational by checking the indicator.
 19. The method of claim 18wherein the connection feature comprises an aperture that passes throughthe end cap.
 20. The method of claim 18 wherein the power indicatorcomprises a light emitting diode.